[Quickfix-users] Creating a correctly typed message from a string

[abaraff <ab...@ra...>]

I'm building an application that in the event of a crash or restart can
reestablish state based on reprocessing messages that it has previously
received.  During normal operation messages that arrive are cracked in the
fromApp callback.  I'd like to be able to use the crack method of the
MessageCracker to reprocess my persisted messages.  Unfortunately, it
appears as though the MessageCracker expects to receive a properly typed
message, and I can't figure out how to construct a properly typed message
from a string or from key-value pairs without completely reinventing the
wheel.

If I construct a quickfix.Message object like this:
quickfix.Message newMessage = new quickfix.Message(persistedString, true);

crack(newMessage, sessionID); will throw an exception stating that:
"java.lang.ClassCastException: quickfix.Message cannot be cast to
quickfix.fix42.Message"

If I construct a quickfix.fix42.Message object like this :
quickfix.Message msg = new quickfix.Message(persistedString, true);
quickfix.fix42.Message newMessage = new quickfix.fix42.Message();
Iterator fieldIterator = msg.getHeader().iterator();
while(fieldIterator.hasNext())
{
    Field fld = (Field) fieldIterator.next();
    newMessage.getHeader().setString(fld.getField(),
fld.getObject().toString());
}fieldIterator = msg.iterator();
while(fieldIterator.hasNext())
{
    Field fld = (Field) fieldIterator.next();
    newMessage.setString(fld.getField(), fld.getObject().toString());
}

crack(msg, sessionID); will throw this exception
"java.lang.ClassCastException: quickfix.fix42.Message cannot be cast to
quickfix.fix42.NewOrderSingle"

Obviously, the API is converting a string into a properly typed Message
somewhere.  Is this machinery accessible?  I could certainly do away with
the cracker or build my own typed message constructor (which would
constitute rewriting a huge chunk of QuickFIX/J) or build some sort of
hacked switch statement.

Thanks,

Anthony

(Message also posted to QuickFIX/J)
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